A visitor from United Kingdom posted Mon November 14, 2011:From the photographer - this happened in reverse thrust. Check out photo ID 0115974 for proof.

A visitor from Singapore posted Mon November 7, 2011:Just for the info, it can only happen during forward thrust

A visitor from United States posted Mon August 18, 2008:In theoretical aerodynamics many effects reach, in an infinitesimal way from positive to negative infinity. This photo illustrates how the rotation of the engine is felt far forward generating a vortex field bounded, in this case by the ground. When humidity conditions are favorable these vortices are often visible in static or slow speed operation.

A visitor from Belgium posted Sat April 1, 2006:I love these atmospheric specialities around aircraft! Perfect timing while capturing this!

Best regards, Walter

A visitor from United Kingdom posted Mon March 27, 2006:Great!!
A Tornado´s coming out the engine. I saw something a few times on the ILA 2004 at Berlin-Schönefeld. Nice